频域差分和时域差分检测OFDM的误码率性能对比  

Comparison of frequency and time domain differential detection BER performance of OFDM

作　　者：宋立军[1] 唐友喜[1] 李少谦[1] 

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室,四川成都610054

出　　处：《电波科学学报》2005年第1期105-109,共5页Chinese Journal of Radio Science

基　　金：国家自然科学基金课题(60272009);教育部博士点基金20020614001;国家高科技发展计划资助课题(2001AA1230131)

摘　　要：　在多径衰落信道条件下,分析了正交频分复用系统的频域差分检测和时域 差分检测的误码率性能,得到了两种系统的误码率解析表达式,并进行了仿真验证。 分析和仿真的结果表明:在保护时隙长度不小于最大多径时延长度的条件下,时域差 分检测的误码率性能不受信道相干带宽变化的影响,时域差分检测的误码率性能主 要受到信道相干时间变化的影响;频域差分检测的误码率性能同时受到信道相干时 间和相干带宽变化的影响,并且相干带宽对频域差分检测的影响更大。The closed form expressions of bit error rate (BER) performance of orthogonal frequency division multiplexing (OFDM) system using the frequency domain differential detection (FDDD) and time domain differential detection (TDDD) are obtained, the theoretical results are evaluated by simulation. If the time delay does not exceed the guard time, the BER performance of TDDD is insensitive to the channel coherent bandwidth, but is sensitive to the change of channel coherent time. The BER performance of FDDD is affected by the channel coherent bandwidth and coherent time at the same time, and it is more sensitive to the change of channel coherent bandwidth.

关 键 词：正交频分复用 频域差分检测 时域差分检测 多径衰落信道 

分 类 号：TN929[电子电信—通信与信息系统]